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Title:
Physiological and Metabolic Responses to Constant-Load
Exercise on an Inclined Stepper and Treadmill

Date of defense:
March 25, 1997

Document Type:
Master's Thesis

Degree:
Master of Science

Department:
Human Nutrition, Foods, and Exercise

Abstract

PHYSIOLOGICAL AND METABOLIC RESPONSES TO CONSTANT-LOAD
EXERCISE ON AN INCLINED STEPPER AND TREADMILL
by
Brian W. Rieger
Dr. Shala Davis, Chairman
Department of Human Nutrition, Foods, and Exercise
(ABSTRACT)
This study evaluated oxygen uptake (VO2), heart rate (HR),
and lactate [HLa] responses between the treadmill (TM) and
the CardiosquatTM 1650 LETM inclined stepper by StairMasterTM
(SM) during constant-load exercise. The slow component of
VO2 (SC) was a central variable assessed during exercise.
Twenty-two healthy college-aged (18-30) subjects completed
an incremental TM and SM exercise test to establish a
workload equivalent to 70% VO2peak. Following each incremental
test, a 20-minute constant-load exercise bout was performed
. Incremental and constant-load exercise bouts were separated
by at least 48 hours. The order of the tests were randomized.
VO2, HR, and [HLa] were evaluated at 5, 10, 15, and 20-minutes
of exercise. Expired gases were analyzed using a Med
Graphics CPX/D metabolic cart. Blood samples were analyzed
immediately for lactate concentration with an automated
lactate analyzer (Yellow Springs Instrument Model 1500 Sport
). A two-way ANOVA with repeated measures was performed on
the rate of change between the treadmill and stepper for
VO2, HR, and [HLa]. No significant differences were found
for any of the response variables (P>0.05). These results
suggest at that the same relative workload, the SM does not
elicit a more pronounced SC than the TM. Based on these
findings, the SM appears to be an appropriate modality of
exercise for various clinical populations.

Keywords:
stepper, incremental, maximal exercise

Availability:
In 3 months.

Public URL:
http://scholar.lib.vt.edu/theses/public/etd-3621142439741131/etd-title.html